The effects of Gd on microstructure of AZ71 magnesium alloy were studied by optical microscope, SEM and X-ray diffraction analyzer. The results show that the alloy mainly contained α-Mg matrix, eutectic α(Mg)+β(Mg_(17)Al_(12)) phase and Al_2Gd phase. The microstructure of alloy was refined and homogeneous by Gd. The volume fraction of β phase is decreased with the addition of Gd, and the β-phase are congregated and coarsened with the excessive Gd.
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